I read this post on
They problem is that the u.save returns true, so it give the impression that all the values got updated. When they did not.
Is there a way to use attr-readonly, but on save return false if an attribute is read only?
class User < ActiveRecord::Base
attr_accessible :name
attr_readonly :name
end
> User.create(name: "lorem")
> u = User.first
=> #<User id: 1, name: "lorem">
> u.name = "ipsum"
=> "ipsum"
> u.save
=> true
> User.first.name
=> "lorem
You can use a validator method to write an error on changes detected to your read only field
Class User
validate :name_not_changed
private
def name_not_changed
return unless name_changed?
errors.add(:name, 'Cannot change name of User')
end
end
Is this really necessary though? If you're making your attribute read-only, why are you still leaving the possibility for it to be changed and additionally need validation errors for that operation? Ideally, you shouldn't permit the name to ever be used when updating models and the story ends there, no validation errors needed.
